Lexmark W820 Service Manual page 145

Step Actions and Questions
4 REGISTRATION SENSOR TEST
Enter Diagnostic Mode and select Registration Sensor.
Open the Left Upper Cover.
Insert and then remove, a sheet of paper into the Registration
Sensor.
Does the Operator Panel LCD change between OP and CL
as you insert then remove the paper?
5 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page
Does the error code appear?
6 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Wiring and connectors linking the FRUs
• I/O PWB - Go to
Attendance Message - Toner Low
The CRU has reached end of life.
Logic Control on the MCU PWB sensed that the EP Cartridge has printed a specified
number of prints and should be replaced with a new one.
Step Actions and Questions
1 CRU REPLACEMENT
Replace the EP Cartridge with a new one.
Does the error code still appear?
2 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page
Does the error code appear?
3 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Wiring and connectors linking the FRUs
• I/O PWB - Go to
4025-XXX
"I/O PWB" on page 4-89.
"I/O PWB" on page 4-89.
Yes
Go to step 5
Go to step 6
4-92.
Yes
Go to step 2
Go to step 3
4-92.
Diagnostic Information
No
Replace the
"Registration
Sensor" on
page 4-56
Problem
solved
No
Problem
solved
Problem
solved
2-49